| 翻訳と辞書 |
| MetroWest Water Supply Tunnel ： ウィキペディア英語版 |
MetroWest Water Supply Tunnel
The MetroWest Water Supply Tunnel (MWWST) is an advanced underground aqueduct that supplies potable water to residents of much of Greater Boston. It is part of the Massachusetts Water Resources Authority (MWRA) water supply system.
This aqueduct starts at the ''John J. Carroll Water Treatment Plant'' in Marlborough, Massachusetts and ends at an MWRA terminal in Weston, Massachusetts. It is about long (28.3 km) and is constructed far below ground level, mostly in bedrock. It includes several vertical risers called shafts, lined with steel, used to make connections throughout the system. It is built underneath portions of Marlborough, Southborough, Framingham, Wayland, and Weston Massachusetts, with a wye intersection 235 feet (71.6 m) below the Massachusetts Turnpike toll booths at State route 128.
==History==
In 1989, the Massachusetts Water Resources Authority (MWRA) issued a planning and design contract for a second transmission main to provide redundancy for the Hultman Aqueduct. As originally conceived, the project consisted of a tunnel combined with reconstruction of the Sudbury Aqueduct, a 19th-century construction that had been taken out of service in 1978.〔(【引用サイトリンク】title=MWRA history )〕 During feasibility studies, it was recognized that costs and environmental and community impact issues related to reconstruction of the Sudbury Aqueduct through an urban/suburban area compared unfavorably with a full length tunnel in rock, deep under existing structures and facilities. The alignment of the tunnel generally coincides with the existing Hultman Aqueduct and is constructed in permanent underground easements below several hundred private properties. The full length, unreinforced concrete lined, pressure tunnel design concept was selected and the facility was named the MetroWest Water Supply Tunnel.
After fewer than 7 years of service,on the morning of May 1, 2010 the tunnel's connection to the city tunnel extension failed, dumping its full capacity of 8 million gallons per hour into the Charles River and forcing 2 million water customers in Boston and surrounding communities to boil their water before drinking it. Emergency supplies from such locations as the Chestnut Hill Reservoir were exposed to air and therefore were susceptible to contamination by animal waste.〔Tunnel failure came before backup could be finished〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「MetroWest Water Supply Tunnel」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|